//===-- X86MCInstLower.cpp - Convert X86 MachineInstr to an MCInst --------===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This file contains code to lower X86 MachineInstrs to their corresponding // MCInst records. // //===----------------------------------------------------------------------===// #include "X86MCInstLower.h" #include "X86AsmPrinter.h" #include "X86MCAsmInfo.h" #include "X86COFFMachineModuleInfo.h" #include "llvm/Analysis/DebugInfo.h" #include "llvm/CodeGen/MachineModuleInfoImpls.h" #include "llvm/MC/MCContext.h" #include "llvm/MC/MCExpr.h" #include "llvm/MC/MCInst.h" #include "llvm/MC/MCStreamer.h" #include "llvm/Target/Mangler.h" #include "llvm/Support/FormattedStream.h" #include "llvm/ADT/SmallString.h" using namespace llvm; const X86Subtarget &X86MCInstLower::getSubtarget() const { return AsmPrinter.getSubtarget(); } MachineModuleInfoMachO &X86MCInstLower::getMachOMMI() const { assert(getSubtarget().isTargetDarwin() &&"Can only get MachO info on darwin"); return AsmPrinter.MMI->getObjFileInfo(); } MCSymbol *X86MCInstLower::GetPICBaseSymbol() const { return Ctx.GetOrCreateSymbol(Twine(AsmPrinter.MAI->getPrivateGlobalPrefix())+ Twine(AsmPrinter.getFunctionNumber())+"$pb"); } /// LowerGlobalAddressOperand - Lower an MO_GlobalAddress operand to an /// MCOperand. MCSymbol *X86MCInstLower:: GetGlobalAddressSymbol(const MachineOperand &MO) const { const GlobalValue *GV = MO.getGlobal(); bool isImplicitlyPrivate = false; if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB || MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY || MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE || MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE) isImplicitlyPrivate = true; SmallString<128> Name; Mang->getNameWithPrefix(Name, GV, isImplicitlyPrivate); if (getSubtarget().isTargetCygMing()) { X86COFFMachineModuleInfo &COFFMMI = AsmPrinter.MMI->getObjFileInfo(); COFFMMI.DecorateCygMingName(Name, GV, *AsmPrinter.TM.getTargetData()); } switch (MO.getTargetFlags()) { default: llvm_unreachable("Unknown target flag on GV operand"); case X86II::MO_NO_FLAG: // No flag. case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name. break; case X86II::MO_DLLIMPORT: { // Handle dllimport linkage. const char *Prefix = "__imp_"; Name.insert(Name.begin(), Prefix, Prefix+strlen(Prefix)); break; } case X86II::MO_DARWIN_NONLAZY: case X86II::MO_DARWIN_NONLAZY_PIC_BASE: { Name += "$non_lazy_ptr"; MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str()); const MCSymbol *&StubSym = getMachOMMI().getGVStubEntry(Sym); if (StubSym == 0) StubSym = AsmPrinter.GetGlobalValueSymbol(GV); return Sym; } case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE: { Name += "$non_lazy_ptr"; MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str()); const MCSymbol *&StubSym = getMachOMMI().getHiddenGVStubEntry(Sym); if (StubSym == 0) StubSym = AsmPrinter.GetGlobalValueSymbol(GV); return Sym; } case X86II::MO_DARWIN_STUB: { Name += "$stub"; MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str()); const MCSymbol *&StubSym = getMachOMMI().getFnStubEntry(Sym); if (StubSym == 0) StubSym = AsmPrinter.GetGlobalValueSymbol(GV); return Sym; } // FIXME: These probably should be a modifier on the symbol or something?? case X86II::MO_TLSGD: Name += "@TLSGD"; break; case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break; case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break; case X86II::MO_TPOFF: Name += "@TPOFF"; break; case X86II::MO_NTPOFF: Name += "@NTPOFF"; break; case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break; case X86II::MO_GOT: Name += "@GOT"; break; case X86II::MO_GOTOFF: Name += "@GOTOFF"; break; case X86II::MO_PLT: Name += "@PLT"; break; } return Ctx.GetOrCreateSymbol(Name.str()); } MCSymbol *X86MCInstLower:: GetExternalSymbolSymbol(const MachineOperand &MO) const { SmallString<128> Name; Name += AsmPrinter.MAI->getGlobalPrefix(); Name += MO.getSymbolName(); switch (MO.getTargetFlags()) { default: llvm_unreachable("Unknown target flag on GV operand"); case X86II::MO_NO_FLAG: // No flag. case X86II::MO_GOT_ABSOLUTE_ADDRESS: // Doesn't modify symbol name. case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name. break; case X86II::MO_DLLIMPORT: { // Handle dllimport linkage. const char *Prefix = "__imp_"; Name.insert(Name.begin(), Prefix, Prefix+strlen(Prefix)); break; } case X86II::MO_DARWIN_STUB: { Name += "$stub"; MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str()); const MCSymbol *&StubSym = getMachOMMI().getFnStubEntry(Sym); if (StubSym == 0) { Name.erase(Name.end()-5, Name.end()); StubSym = Ctx.GetOrCreateSymbol(Name.str()); } return Sym; } // FIXME: These probably should be a modifier on the symbol or something?? case X86II::MO_TLSGD: Name += "@TLSGD"; break; case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break; case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break; case X86II::MO_TPOFF: Name += "@TPOFF"; break; case X86II::MO_NTPOFF: Name += "@NTPOFF"; break; case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break; case X86II::MO_GOT: Name += "@GOT"; break; case X86II::MO_GOTOFF: Name += "@GOTOFF"; break; case X86II::MO_PLT: Name += "@PLT"; break; } return Ctx.GetOrCreateSymbol(Name.str()); } MCSymbol *X86MCInstLower::GetJumpTableSymbol(const MachineOperand &MO) const { SmallString<256> Name; // FIXME: Use AsmPrinter.GetJTISymbol. @TLSGD shouldn't be part of the symbol // name! raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix() << "JTI" << AsmPrinter.getFunctionNumber() << '_' << MO.getIndex(); switch (MO.getTargetFlags()) { default: llvm_unreachable("Unknown target flag on GV operand"); case X86II::MO_NO_FLAG: // No flag. case X86II::MO_PIC_BASE_OFFSET: case X86II::MO_DARWIN_NONLAZY_PIC_BASE: case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE: break; // FIXME: These probably should be a modifier on the symbol or something?? case X86II::MO_TLSGD: Name += "@TLSGD"; break; case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break; case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break; case X86II::MO_TPOFF: Name += "@TPOFF"; break; case X86II::MO_NTPOFF: Name += "@NTPOFF"; break; case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break; case X86II::MO_GOT: Name += "@GOT"; break; case X86II::MO_GOTOFF: Name += "@GOTOFF"; break; case X86II::MO_PLT: Name += "@PLT"; break; } // Create a symbol for the name. return Ctx.GetOrCreateSymbol(Name.str()); } MCSymbol *X86MCInstLower:: GetConstantPoolIndexSymbol(const MachineOperand &MO) const { SmallString<256> Name; // FIXME: USe AsmPrinter.GetCPISymbol. @TLSGD shouldn't be part of the symbol // name! raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix() << "CPI" << AsmPrinter.getFunctionNumber() << '_' << MO.getIndex(); switch (MO.getTargetFlags()) { default: llvm_unreachable("Unknown target flag on GV operand"); case X86II::MO_NO_FLAG: // No flag. case X86II::MO_PIC_BASE_OFFSET: case X86II::MO_DARWIN_NONLAZY_PIC_BASE: case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE: break; // FIXME: These probably should be a modifier on the symbol or something?? case X86II::MO_TLSGD: Name += "@TLSGD"; break; case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break; case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break; case X86II::MO_TPOFF: Name += "@TPOFF"; break; case X86II::MO_NTPOFF: Name += "@NTPOFF"; break; case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break; case X86II::MO_GOT: Name += "@GOT"; break; case X86II::MO_GOTOFF: Name += "@GOTOFF"; break; case X86II::MO_PLT: Name += "@PLT"; break; } // Create a symbol for the name. return Ctx.GetOrCreateSymbol(Name.str()); } MCSymbol *X86MCInstLower:: GetBlockAddressSymbol(const MachineOperand &MO) const { const char *Suffix = ""; switch (MO.getTargetFlags()) { default: llvm_unreachable("Unknown target flag on BA operand"); case X86II::MO_NO_FLAG: break; // No flag. case X86II::MO_PIC_BASE_OFFSET: break; // Doesn't modify symbol name. case X86II::MO_GOTOFF: Suffix = "@GOTOFF"; break; } return AsmPrinter.GetBlockAddressSymbol(MO.getBlockAddress(), Suffix); } MCOperand X86MCInstLower::LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const { // FIXME: We would like an efficient form for this, so we don't have to do a // lot of extra uniquing. const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx); switch (MO.getTargetFlags()) { default: llvm_unreachable("Unknown target flag on GV operand"); case X86II::MO_NO_FLAG: // No flag. // These affect the name of the symbol, not any suffix. case X86II::MO_DARWIN_NONLAZY: case X86II::MO_DLLIMPORT: case X86II::MO_DARWIN_STUB: case X86II::MO_TLSGD: case X86II::MO_GOTTPOFF: case X86II::MO_INDNTPOFF: case X86II::MO_TPOFF: case X86II::MO_NTPOFF: case X86II::MO_GOTPCREL: case X86II::MO_GOT: case X86II::MO_GOTOFF: case X86II::MO_PLT: break; case X86II::MO_PIC_BASE_OFFSET: case X86II::MO_DARWIN_NONLAZY_PIC_BASE: case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE: // Subtract the pic base. Expr = MCBinaryExpr::CreateSub(Expr, MCSymbolRefExpr::Create(GetPICBaseSymbol(), Ctx), Ctx); break; } if (!MO.isJTI() && MO.getOffset()) Expr = MCBinaryExpr::CreateAdd(Expr, MCConstantExpr::Create(MO.getOffset(), Ctx), Ctx); return MCOperand::CreateExpr(Expr); } static void lower_subreg32(MCInst *MI, unsigned OpNo) { // Convert registers in the addr mode according to subreg32. unsigned Reg = MI->getOperand(OpNo).getReg(); if (Reg != 0) MI->getOperand(OpNo).setReg(getX86SubSuperRegister(Reg, MVT::i32)); } static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) { // Convert registers in the addr mode according to subreg64. for (unsigned i = 0; i != 4; ++i) { if (!MI->getOperand(OpNo+i).isReg()) continue; unsigned Reg = MI->getOperand(OpNo+i).getReg(); if (Reg == 0) continue; MI->getOperand(OpNo+i).setReg(getX86SubSuperRegister(Reg, MVT::i64)); } } void X86MCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const { OutMI.setOpcode(MI->getOpcode()); for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) { const MachineOperand &MO = MI->getOperand(i); MCOperand MCOp; switch (MO.getType()) { default: MI->dump(); llvm_unreachable("unknown operand type"); case MachineOperand::MO_Register: // Ignore all implicit register operands. if (MO.isImplicit()) continue; MCOp = MCOperand::CreateReg(MO.getReg()); break; case MachineOperand::MO_Immediate: MCOp = MCOperand::CreateImm(MO.getImm()); break; case MachineOperand::MO_MachineBasicBlock: MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create( AsmPrinter.GetMBBSymbol(MO.getMBB()->getNumber()), Ctx)); break; case MachineOperand::MO_GlobalAddress: MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO)); break; case MachineOperand::MO_ExternalSymbol: MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO)); break; case MachineOperand::MO_JumpTableIndex: MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO)); break; case MachineOperand::MO_ConstantPoolIndex: MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO)); break; case MachineOperand::MO_BlockAddress: MCOp = LowerSymbolOperand(MO, GetBlockAddressSymbol(MO)); break; } OutMI.addOperand(MCOp); } // Handle a few special cases to eliminate operand modifiers. switch (OutMI.getOpcode()) { case X86::LEA64_32r: // Handle 'subreg rewriting' for the lea64_32mem operand. lower_lea64_32mem(&OutMI, 1); break; case X86::MOVZX16rr8: OutMI.setOpcode(X86::MOVZX32rr8); lower_subreg32(&OutMI, 0); break; case X86::MOVZX16rm8: OutMI.setOpcode(X86::MOVZX32rm8); lower_subreg32(&OutMI, 0); break; case X86::MOVSX16rr8: OutMI.setOpcode(X86::MOVSX32rr8); lower_subreg32(&OutMI, 0); break; case X86::MOVSX16rm8: OutMI.setOpcode(X86::MOVSX32rm8); lower_subreg32(&OutMI, 0); break; case X86::MOVZX64rr32: OutMI.setOpcode(X86::MOV32rr); lower_subreg32(&OutMI, 0); break; case X86::MOVZX64rm32: OutMI.setOpcode(X86::MOV32rm); lower_subreg32(&OutMI, 0); break; case X86::MOV64ri64i32: OutMI.setOpcode(X86::MOV32ri); lower_subreg32(&OutMI, 0); break; case X86::MOVZX64rr8: OutMI.setOpcode(X86::MOVZX32rr8); lower_subreg32(&OutMI, 0); break; case X86::MOVZX64rm8: OutMI.setOpcode(X86::MOVZX32rm8); lower_subreg32(&OutMI, 0); break; case X86::MOVZX64rr16: OutMI.setOpcode(X86::MOVZX32rr16); lower_subreg32(&OutMI, 0); break; case X86::MOVZX64rm16: OutMI.setOpcode(X86::MOVZX32rm16); lower_subreg32(&OutMI, 0); break; case X86::MOV16r0: OutMI.setOpcode(X86::MOV32r0); lower_subreg32(&OutMI, 0); break; case X86::MOV64r0: OutMI.setOpcode(X86::MOV32r0); lower_subreg32(&OutMI, 0); break; } } void X86AsmPrinter::printInstructionThroughMCStreamer(const MachineInstr *MI) { X86MCInstLower MCInstLowering(OutContext, Mang, *this); switch (MI->getOpcode()) { case TargetInstrInfo::DBG_LABEL: case TargetInstrInfo::EH_LABEL: case TargetInstrInfo::GC_LABEL: printLabel(MI); return; case TargetInstrInfo::DEBUG_VALUE: { // FIXME: if this is implemented for another target before it goes // away completely, the common part should be moved into AsmPrinter. if (!VerboseAsm) return; O << '\t' << MAI->getCommentString() << "DEBUG_VALUE: "; unsigned NOps = MI->getNumOperands(); // cast away const; DIetc do not take const operands for some reason. DIVariable V((MDNode*)(MI->getOperand(NOps-1).getMetadata())); O << V.getName(); O << " <- "; if (NOps==3) { // Variable is in register assert(MI->getOperand(0).getType()==MachineOperand::MO_Register); printOperand(MI, 0); } else { // Frame address. Currently handles register +- offset only. assert(MI->getOperand(0).getType()==MachineOperand::MO_Register); assert(MI->getOperand(3).getType()==MachineOperand::MO_Immediate); O << '['; printOperand(MI, 0); O << '+'; printOperand(MI, 3); O << ']'; } O << "+"; printOperand(MI, NOps-2); return; } case TargetInstrInfo::INLINEASM: printInlineAsm(MI); return; case TargetInstrInfo::IMPLICIT_DEF: printImplicitDef(MI); return; case TargetInstrInfo::KILL: printKill(MI); return; case X86::MOVPC32r: { MCInst TmpInst; // This is a pseudo op for a two instruction sequence with a label, which // looks like: // call "L1$pb" // "L1$pb": // popl %esi // Emit the call. MCSymbol *PICBase = MCInstLowering.GetPICBaseSymbol(); TmpInst.setOpcode(X86::CALLpcrel32); // FIXME: We would like an efficient form for this, so we don't have to do a // lot of extra uniquing. TmpInst.addOperand(MCOperand::CreateExpr(MCSymbolRefExpr::Create(PICBase, OutContext))); printMCInst(&TmpInst); O << '\n'; // Emit the label. OutStreamer.EmitLabel(PICBase); // popl $reg TmpInst.setOpcode(X86::POP32r); TmpInst.getOperand(0) = MCOperand::CreateReg(MI->getOperand(0).getReg()); printMCInst(&TmpInst); return; } case X86::ADD32ri: { // Lower the MO_GOT_ABSOLUTE_ADDRESS form of ADD32ri. if (MI->getOperand(2).getTargetFlags() != X86II::MO_GOT_ABSOLUTE_ADDRESS) break; // Okay, we have something like: // EAX = ADD32ri EAX, MO_GOT_ABSOLUTE_ADDRESS(@MYGLOBAL) // For this, we want to print something like: // MYGLOBAL + (. - PICBASE) // However, we can't generate a ".", so just emit a new label here and refer // to it. We know that this operand flag occurs at most once per function. const char *Prefix = MAI->getPrivateGlobalPrefix(); MCSymbol *DotSym = OutContext.GetOrCreateSymbol(Twine(Prefix)+"picbaseref"+ Twine(getFunctionNumber())); OutStreamer.EmitLabel(DotSym); // Now that we have emitted the label, lower the complex operand expression. MCSymbol *OpSym = MCInstLowering.GetExternalSymbolSymbol(MI->getOperand(2)); const MCExpr *DotExpr = MCSymbolRefExpr::Create(DotSym, OutContext); const MCExpr *PICBase = MCSymbolRefExpr::Create(MCInstLowering.GetPICBaseSymbol(), OutContext); DotExpr = MCBinaryExpr::CreateSub(DotExpr, PICBase, OutContext); DotExpr = MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(OpSym,OutContext), DotExpr, OutContext); MCInst TmpInst; TmpInst.setOpcode(X86::ADD32ri); TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(0).getReg())); TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(1).getReg())); TmpInst.addOperand(MCOperand::CreateExpr(DotExpr)); printMCInst(&TmpInst); return; } } MCInst TmpInst; MCInstLowering.Lower(MI, TmpInst); printMCInst(&TmpInst); }